Are false positives in suicide classification models a risk group? Evidence for “true alarms” in a population-representative longitudinal study of Norwegian adolescents by E. F. Haghish, Bruno Laeng, Bruno Laeng, Nikolai Czajkowski, Nikolai Czajkowski

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Advantages of linking national registries with twin registries for epidemiological research by Line C. Gjerde, Fartein Ask Torvik, Kristian Amundsen Østby, Gun Peggy Knudsen, Nikolai Czajkowski, Ted Reichborn-Kjennerud, Ragnhild E. Ørstavik

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The Norwegian Twin Registry by Thomas S. Nilsen, Ingunn Brandt, Nikolai Czajkowski, Gun Peggy Knudsen, Per Magnus, Ted Reichborn-Kjennerud, Kristian Tambs, Jennifer R. Harris, Ragnhild Ørstavik

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Does low alcohol use increase the risk of sickness absence? A discordant twin study by Kristian Amundsen Østby, Nikolai Czajkowski, Gun Peggy Knudsen, Eivind Ystrøm, Line C. Gjerde, Kenneth S. Kendler, Ragnhild E Ørstavik, Ted Reichborn-Kjennerud

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